diff --git a/core/logs/formatter.go b/core/logs/formatter.go
index 67500b2b..80b30fa0 100644
--- a/core/logs/formatter.go
+++ b/core/logs/formatter.go
@@ -69,8 +69,8 @@ func (p *PatternLogFormatter) ToString(lm *LogMsg) string {
 		'm': lm.Msg,
 		'n': strconv.Itoa(lm.LineNumber),
 		'l': strconv.Itoa(lm.Level),
-		't': levelPrefix[lm.Level-1],
-		'T': levelNames[lm.Level-1],
+		't': levelPrefix[lm.Level],
+		'T': levelNames[lm.Level],
 		'F': lm.FilePath,
 	}
 	_, m['f'] = path.Split(lm.FilePath)
diff --git a/core/logs/formatter_test.go b/core/logs/formatter_test.go
index a97765ac..a1853d72 100644
--- a/core/logs/formatter_test.go
+++ b/core/logs/formatter_test.go
@@ -88,7 +88,7 @@ func TestPatternLogFormatter(t *testing.T) {
 	}
 	got := tes.ToString(lm)
 	want := lm.FilePath + ":" + strconv.Itoa(lm.LineNumber) + "|" +
-		when.Format(tes.WhenFormat) + levelPrefix[lm.Level-1] + ">> " + lm.Msg
+		when.Format(tes.WhenFormat) + levelPrefix[lm.Level] + ">> " + lm.Msg
 	if got != want {
 		t.Errorf("want %s, got %s", want, got)
 	}